diff --git a/similar/main/endlevel.cpp b/similar/main/endlevel.cpp
index 0aa27d2b5..815e18249 100644
--- a/similar/main/endlevel.cpp
+++ b/similar/main/endlevel.cpp
@@ -139,6 +139,7 @@ static void draw_stars(grs_canvas &, const d_unique_endlevel_state::starfield_ty
 static int find_exit_side(const object_base &obj);
 static void generate_starfield(d_unique_endlevel_state::starfield_type &stars);
 static void start_endlevel_flythrough(flythrough_data *flydata,const vmobjptr_t obj,fix speed);
+static void draw_mine_exit_cover(grs_canvas &);
 
 #if defined(DXX_BUILD_DESCENT_II)
 constexpr array<const char, 24> movie_table{{
@@ -897,11 +898,49 @@ static int find_exit_side(const object_base &obj)
 	return best_side;
 }
 
+inline void prepare_mine_exit_cover_point(g3s_point& p, const vms_vector &v, fix u, fix r)
+{
+	vms_vector tv;
+	vm_vec_scale_add(tv,v,mine_exit_orient.uvec,u);
+	vm_vec_scale_add2(tv,mine_exit_orient.rvec,r);
+	p = g3_rotate_point(tv);
+}
+
+void draw_mine_exit_cover(grs_canvas &canvas)
+{
+	int of=10;
+	fix u=i2f(6),d=i2f(9),ur=i2f(14),dr=i2f(17);
+	const uint8_t color = BM_XRGB(0, 0, 0);
+	array<cg3s_point *, 4> pointlist;
+	vms_vector v;
+	g3s_point p0, p1, p2, p3;
+
+	vm_vec_scale_add(v,mine_exit_point,mine_exit_orient.fvec,i2f(of));
+
+	prepare_mine_exit_cover_point(p0,v,+u,+ur);
+	prepare_mine_exit_cover_point(p1,v,+u,-ur);
+	prepare_mine_exit_cover_point(p2,v,-d,-dr);
+	prepare_mine_exit_cover_point(p3,v,-d,+dr);
+
+	pointlist[0] = &p0;
+	pointlist[1] = &p1;
+	pointlist[2] = &p2;
+	pointlist[3] = &p3;
+
+	g3_draw_poly(canvas, pointlist.size(), pointlist, color);
+}
+
 void draw_exit_model(grs_canvas &canvas)
 {
 	int f=15,u=0;	//21;
 	g3s_lrgb lrgb = { f1_0, f1_0, f1_0 };
 
+	if (mine_destroyed)
+	{
+		// draw black shape to mask out terrain in exit hatch
+		draw_mine_exit_cover(canvas);
+	}
+
 	auto model_pos = vm_vec_scale_add(mine_exit_point,mine_exit_orient.fvec,i2f(f));
 	vm_vec_scale_add2(model_pos,mine_exit_orient.uvec,i2f(u));
 	draw_polygon_model(canvas, model_pos, mine_exit_orient, nullptr, mine_destroyed ? destroyed_exit_modelnum : exit_modelnum, 0, lrgb, nullptr, nullptr);